c++ - Uninitialised value in cmp function qsort -

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i'm trying understand what's wrong code:

int mycompare( const void * v1, const void * v2 ){    const int * f1 = static_cast<const int *>(v1);    const int * f2 = static_cast<const int *>(v2);    if( f1[ 0 ] < f2[ 0 ] ) return -1;    if( f1[ 0 ] > f2[ 0 ] ) return +1;    return 0; }

this comparator function qsort work's fine when i've profiled valgrind have message in strings conditional jump or move depends on uninitialised value(s)

 if( f1[ 0 ] < f2[ 0 ] ) return -1;  if( f1[ 0 ] > f2[ 0 ] ) return +1;

qsort calling here

valgrind output

==25053== conditional jump or move depends on uninitialised value(s) ==25053==    @ 0x66474cb: msort_with_tmp.part.0 (msort.c:83) ==25053==    0x6647221: msort_with_tmp.part.0 (msort.c:45) ==25053==    0x6647221: msort_with_tmp.part.0 (msort.c:45) ==25053==    0x664777b: qsort_r (msort.c:45) ==25053==    0x40d002: owopenclsolver::_runsort(owconfigprorerty*)(owopenclsolver.cpp:473) ==25053==    0x4114db: owphysicsfluidsimulator::simulationstep(bool) (owphysicsfluidsimulator.cpp:186) ==25053==    0x412fbc: run(int, char**, bool) (owworldsimulation.cpp:919) ==25053==    0x4058d4: main (main.cpp:95) ==25053==  uninitialised value created client request ==25053==    @ 0xa6af9f8: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa69bf40: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa3dcb0f: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa42deca: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa37e03f: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa3558d0: ??? (in /usr/lib/libamdocl64.so)enter code here ==25053==    0xa35a1c1: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa35a2ec: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa32972d: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa2d095e: ??? (in /usr/lib/libamdocl64.so) ==25053==    0xa337aeb: ??? (in /usr/lib/libamdocl64.so) ==25053==    0x6bdd181: start_thread (pthread_create.c:312)

update

actually in class owopenclsolver i'm using sort function have no 1 places buffer _particleindex(buffer sort than) initializing explicitly initialization going in function copy_buffer_from_device copying data opencl device host programm buffer. may problem in valgrind doesn't think _particleindex isn't init when function using it.

valgrind traces memory reads , writes , think here it's telling function happened called @ least 1 pointer memory that's never been written to, of moment of call.


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